#pragma once 
#include<iostream>
#include<unistd.h>
using namespace std;
typedef void(*work_t)(int);
typedef void(*task_t)(int,pid_t);
void PrintLog(int fd, pid_t pid)//fd 管道的写端，pid子进程pid
{
     cout << "sub process: " << pid << ", fd: " << fd<< ", task is : printf log task\n" << endl;
}

void ReloadConf(int fd, pid_t pid)
{
    cout << "sub process: " << pid << ", fd: " << fd<< ", task is : reload conf task\n" << endl;
}

void ConnectMysql(int fd, pid_t pid)
{
    cout << "sub process: " << pid << ", fd: " << fd<< ", task is : mysconnectql task\n" << endl;
}
task_t tasks[3] = {PrintLog, ReloadConf, ConnectMysql};

uint32_t NextTask()
{
    return rand() % 3;
}
void worker(int fd)
{
    //子进程从标准输出中读取
    while(true)
    {
        uint32_t command_code = 0;
        ssize_t n = read(0, &command_code, sizeof(command_code));
        if(n == sizeof(command_code))
        {
            if(command_code >= 3) continue;//当读取的任务码大于3时，说明读取错误
            tasks[command_code](fd,getpid());//函数指针调用
        }
        else if(n == 0)//当管道的写端关闭时，且管道内的文件为空时，read函数会返回0
        {
            cout<<"sub process: "<<getpid()<<" quit new..."<<endl;
            break;
        }
    }
}